Allocated number to another client inexplicably

Friday my daughters cell showed no service, called to enquire and they are apparently looking into it. Sat I try call my daughters number and another person answers her number informs me this number has just been activated as her new number! 121 tell me this is not possible but I have spoken to this other lady twice. Also have been billing me for 500MG of data on my 2 contracts without giving the data to, this has been going on for months with no resolution. They have had various excuses at various times. Last time I was told yes the data wasn't being given but that I wasn't being billed, and would be activated going forward. That was I think 2 months back. At least. So now my daughter sitting without her cell number, and still no data activated on either account, or word of my refund (should be 5 months x R298). Service ethic is non existent. Asked for an email confirming that they acknowledge my 3 queries, got it but they only mention following up on the data on one contract, nothing about the other contract, refund or number that was given away. I am shocked that they get away with this terrible client service.